The first patch of this series improves read randomness to avoid excessive device read cache hit under a random read pattern for a device with very few written zones. With this patch applied, on a 14TB SMR disk with only 100 zones written, random read performance results change from several thousands IOPS down to a more realistic disk-like 100 IOPS or so. The second patch cleans up zbd related declarations. The third and fourth patches fix small bugs. Finally, the last patch cleans up the code by switching to using bytes unit for all zone information (start, length and write pointer position). Changes from v1: * Reworked first patch according to Bart's comments. * Fixed typo in second patch title * Added patches 3 to 5 Damien Le Moal (5): zbd: Improve read randomness zbd: Remove inexitent function declaration zbd: Do not read offline zones zbd: Fix zbd_zone_idx() zbd: Use bytes unit zbd.c | 137 +++++++++++++++++++++++++++++++++++----------------------- zbd.h | 12 ----- 2 files changed, 83 insertions(+), 66 deletions(-) -- 2.17.1
